Radio Frequency IDentification (RFID) tag is a promising device for the management of products at a very low cost.
Huge number of such low-cost sensors can be installed to the structure beforehand, after a disaster we can access to
these sensors wirelessly and very easily. In this system, an electrically conductive paint or printed sheet is applied to a
part of structure in which crack will occur. Copper wire is connected to the attachment on the structure and a RFID tag.
When a crack occurs, the paint or printed sheet is broken, resulting in an increase in resistance. Crack width can be
estimated by the ability of an RFID transmitter to communicate with the tag. By bending tests of concrete specimens,
the relationships between concrete crack width and conductivity of the materials are examined. It is shown that the level
of concrete crack width can be related to the ability of the paint or printed sheet to conduct electricity or not. This
printed sheet is also applied for steel crack. By fatigue test of steel specimen with a notch, very small steel crack can be
detected by this sensor.
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